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Ed-man, how long does this unit run for, what are your actual suction and discharge pressure readings. Does it go through its start and transition? What are the amps at start up and how long does it take to start loading up.
Have you already ohm'd out the saturation and suction temperature sensors. Have you checked voltage drop. How about water flow? What is the entering water pressure versus leaving water pressure. What circuit No. are you having trouble with.

It is possible that you have a unload/load problem which may be causing a low suction saturation temperature. It is important to watch the amp draw at start up which should be around 33% and load up gradually. Watch amp draw increase slowly as this will indicate loading. It sounds like you may be loading too quickly which may be caused by an oil flow/pressure problem. Have you checked the oil level in the separator and how high/low is it? Also what is the oil pressure differential and are you sure that the oil filter is unrestricted.

Here is a bulletin which may not be the exact one for your unit but will give you and idea. Verify your maximum recommended oil pressure differential for your unit : Diagnostic troubleshooting bulletin RTAA-SVD01A-EN

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Understand the symptoms and you will find a solution.